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A platinum resistance thermometer is placed in a duct to measure the temperature of an airflow stream. The thermometer is placed inside a cylindrical shell 6 mm in diameter which has a polished outside surface with ? = 0.08 ± 0.02. The airstream velocity is known to be 3 m/s and the pressure is 1.0 atm. The thermometer indicates a temperature of 115?C. The duct wall temperature is measured at 193?C. Calculate the true air temperature and estimate the uncertainty in this temperature. Assume that the uncertainty in the convection heat-transfer coefficient calculated with the appropriate formula from Table 8.6 is ±15 percent. Assume that the uncertainty in the resistance-thermometer measurement is ±0.03?C.
a heat pump in a home is to serve as a heater in winter and an air conditioner in summer. this device transfers heat
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A typical gas stove burner supplies a kettle filled with water at a rate of 15,000 Btu/hr with a flame temperature of 750C. The gas fed to the burner is composed of propane mixed with 10% excess air. The gas feed is initially at -20C and 1 bar and th..
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Water enters the steam generator of the power plant shown in the figure at 7MPa, 50 degrees C, and exits at 7MPa, 600 degrees C. The steam is then fed into a well-insulated turbine, developing a power output of 31.6 MW before exiting the turbine as a..
1. A reversible power cycle operating between hot and cold reservoirs at 1000 K and 300 K, respectively, receives 100 kJ by heat transfer from the hot reservoir for each cycle of operation. Determine the net work developed in 10 cycles of operatio..
a round compression member with both ends pinned and made of aisi cold-drawn steel sy441 mpa e207 gpa is to be used in
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